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COMP Cams 503-1
Representative Image
Product images may differ from actual product appearance.

COMP Cams Positive Stop PTFE Seal Guide Size: .530"

249-503-1

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$1.99
COMP Cams Positive Stop PTFE Seal Guide Size: .530" $1.99
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Positive Stop PTFE Seal
  • Guide Size: .530''
  • Valve Size: 11/32''
  • 1/pkg
  • COMP Cams 503-1 Details

    Positive Stop PTFE Seals

  • 1 Year Limited Warranty

  • Specifications:

    Diameter (in.)
    0.34375
    Machine Work Required
    Yes
    Quantity
    Sold individually
    Valve Guide Diameter (in.)
    0.53
    Valve Stem Diameter (in.)
    0.344
    Valve Stem Seal Material
    PTFE
    Valve Stem Seal Type
    Positive stop
    Manufacturer's Part Number:
    503-1

    Comp Cams offers a complete line of valve stem seals, from the stock GM O-ring to the positive stop PTFE seal. These seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. O-ring seals use the standard retainer and oil splash shield. Umbrella seals are normally used when a larger-than-stock diameter spring is used; in the case of a double spring, positive stop PTFE seals are used. There is also a smaller diameter Viton seal available for triple spring applications. O-rings and umbrella seals require no machining, but PTFE seals require the heads to be disassembled so the top guides can be machined with a special .530" diameter cutter. Whenever you're planning an overhaul or cam change, don't forget the valve seals!

    Features:
  • Excellent Sealing Properties
  • O-Ring & Umbrella Seals Require No Machining

  • Does COMP Cams 503-1 fit your vehicle?

    Narrow Results
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    1968 OLDSMOBILE VISTA CRUISER

    • CC: 5737
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1969 OLDSMOBILE VISTA CRUISER

    • CC: 6555
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1968-1974 PONTIAC FIREBIRD

    • CC: 5733
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1983-1984 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1982-1984 OLDSMOBILE CUTLASS CALAIS

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1969 PONTIAC FIREBIRD

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: TRANS AM

    1988-1995 CHEVROLET C1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: CHEYENNE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1969-1970 FORD FAIRLANE

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: 500
    • Engine Vin: H
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1977-1978 FORD F-150

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1982-1983 CHEVROLET CELEBRITY

    • CC: 2474
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 2.5
    • SubModel: BASE
    • CUI: 151
    • EngineType: L4 ( 2.5 L / 151 )

    1973 PONTIAC LEMANS

    • CC: 5733
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1972 MERCURY MONTEREY

    • CC: 7539
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1989 CHEVROLET R2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SILVERADO
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 MERCURY MARQUIS

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1956 PONTIAC CATALINA

    • CC: 5179
    • Liter: 5.2
    • SubModel: BASE
    • CUI: 316
    • EngineType: V8 ( 5.2 L / 316 )

    1983 OLDSMOBILE CUTLASS CALAIS

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: HURST
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1973-1974 FORD RANCH WAGON

    • CC: 7539
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1973-1974 FORD GRAN TORINO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SPORT
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1974 FORD RANCHERO

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: GT
    • Engine Vin: H
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: CUSTOM
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1987-1991 CHEVROLET BLAZER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SILVERADO
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1974 PONTIAC VENTURA

    • CC: 5737
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1977 BUICK SKYLARK

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • Aspiration: N
    • SubModel: SR
    • Engine Vin: R
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1977-1978 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1993-1995 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: XLT
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1967 OLDSMOBILE CUTLASS

    • CC: 6555
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: TURNPIKE CRUISER
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1977 PONTIAC FIREBIRD

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 403
    • EngineType: V8 ( 6.6 L / 403 )

    1968 PONTIAC TEMPEST

    • CC: 5733
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SAFARI
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980-1982 FORD E-350 ECONOLINE CLUB WAGON

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1984-1986 FORD E-150 ECONOLINE CLUB WAGON

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: XLT
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1967 MERCURY COMMUTER

    • CC: 4727
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1974 FORD GRAN TORINO

    • CC: 7539
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • Aspiration: N
    • SubModel: ELITE
    • Engine Vin: A
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1963-1967 FORD COUNTRY SEDAN

    • CC: 4727
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.7
    • SubModel: BASE
    • CUI: 289
    • EngineType: V8 ( 4.7 L / 289 )

    1979 OLDSMOBILE DELTA 88

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.9
    • SubModel: BASE
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1969-1970 FORD CUSTOM

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: H
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1990 CADILLAC BROUGHAM

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: D'ELEGANCE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1985-1992 FORD BRONCO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: EDDIE BAUER
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1980-1982 OLDSMOBILE OMEGA

    • CC: 2474
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 2.5
    • SubModel: BROUGHAM
    • CUI: 151
    • EngineType: L4 ( 2.5 L / 151 )

    1975-1979 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: RANGER XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1983-1991 FORD E-350 ECONOLINE CLUB WAGON

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: XL
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1994-1995 CHEVROLET K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981-1984 BUICK ELECTRA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: PARK AVENUE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1970 FORD TORINO

    • CC: 7014
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: BROUGHAM
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1986-1987 BUICK REGAL

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1979 BUICK CENTURY

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.9
    • SubModel: SPECIAL
    • CUI: 301
    • EngineType: V8 ( 4.9 L / 301 )

    1974 FORD RANCHERO

    • CC: 7539
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: GT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1983-1986 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1987-1988 CHEVROLET R10 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SCOTTSDALE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1972-1974 OLDSMOBILE 98

    • CC: 7457
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1979 FORD F-100

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: RANGER XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1973-1974 PONTIAC LEMANS

    • CC: 6555
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: SPORT
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1975 PONTIAC VENTURA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: CUSTOM
    • CUI: 260
    • EngineType: V8 ( 4.3 L / 260 )

    1980-1985 OLDSMOBILE DELTA 88

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: ROYALE BROUGHAM
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1978 BUICK RIVIERA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: LXXV ANNIVERSARY EDITION
    • CUI: 403
    • EngineType: V8 ( 6.6 L / 403 )

    1973-1974 PONTIAC FIREBIRD

    • CC: 7456
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • Aspiration: N
    • SubModel: FORMULA
    • Engine Vin: Y
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1990-1995 CHEVROLET C1500 PICKUP

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: WT
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1970-1971 FORD MUSTANG

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: MACH I
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1976-1977 FORD F-100

    • CC: 4949
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: G
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1979 CADILLAC ELDORADO

    • Liter: 5.7
    • SubModel: CABRIOLET
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 OLDSMOBILE CUTLASS CRUISER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1977-1978 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: NORTHLAND
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1964-1965 GRIFFITH 200

    • EngineType: ALL
    • SubModel: ALL

    1976 MERCURY MONTEGO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: MX VILLAGER

    1975-1982 FORD E-100 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: CHATEAU
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1969-1975 FORD E-100 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1970 FORD COUNTRY SQUIRE

    • CC: 7014
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1972-1974 PONTIAC FIREBIRD

    • CC: 7456
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • Aspiration: N
    • SubModel: TRANS AM
    • Engine Vin: X
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1988-1991 CHEVROLET K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: CHEYENNE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1987 CHEVROLET G10 VAN

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BONAVENTURE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1994-1995 CHEVROLET K1500 PICKUP

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1986 CHEVROLET CAPRICE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: CLASSIC BROUGHAM
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1973-1974 FORD TORINO

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: H
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1992 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: XLT LARIAT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1992 GMC C2500 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • Aspiration: N
    • SubModel: SLE
    • Engine Vin: K
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1972-1973 PONTIAC FIREBIRD

    • CC: 6555
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • Aspiration: N
    • SubModel: ESPRIT
    • Engine Vin: R
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1971 MERCURY MONTEGO

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: M
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1981 PONTIAC CATALINA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SAFARI
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1972 PONTIAC LEMANS

    • CC: 5737
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1992-1993 FORD E-150 ECONOLINE CLUB WAGON

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: CHATEAU
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1972-1973 PONTIAC LEMANS

    • CC: 7457
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1977 OLDSMOBILE OMEGA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • Aspiration: N
    • SubModel: DELUXE
    • Engine Vin: R
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1987-1992 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1970-1971 FORD TORINO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: SUPER COBRA JET

    1984-1986 FORD E-150 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1992-1995 FORD E-350 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1987-1991 MERCURY GRAND MARQUIS

    • EngineType: ALL
    • SubModel: LS

    1984-1985 LINCOLN MARK VII

    • Liter: 5.0
    • SubModel: BILL BLASS
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1975 OLDSMOBILE VISTA CRUISER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1975-1980 FORD LTD

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1975 OLDSMOBILE 98

    • Liter: 6.6
    • SubModel: REGENCY
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1970-1971 OLDSMOBILE 442

    • CC: 7456
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1975-1982 FORD E-350 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BASE
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1969 MERCURY COMET

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: M
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1975 PONTIAC GRAND AM

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8 ( 7.5 L / 455 )

    1993-1995 FORD F-150

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: XLT
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )

    1979-1982 FORD E-150 ECONOLINE CLUB WAGON

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 302
    • EngineType: V8 ( 5.0 L / 302 )

    1987 CHEVROLET V10 PICKUP

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SILVERADO
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1987-1988 CHEVROLET CAPRICE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1981 PONTIAC BONNEVILLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BROUGHAM
    • CUI: 307
    • EngineType: V8 ( 5.0 L / 307 )

    1971 MERCURY MONTEGO

    • CC: 5753
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: MX
    • Engine Vin: M
    • CUI: 351
    • EngineType: V8 ( 5.8 L / 351 )
    503-1 is rated 1.0 out of 5 by 1.
    Rated 1 out of 5 by from Junk They are .530 but they won't hold , I used the comp valve guide cutter for these and they just pop off . Use metal capped viton seals . They are way better ! And tight fit !
    Date published: 2017-06-01
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    Items You Need

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    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.

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